Update app.py

-- HF Chat fixes

app.py

@@ -11,14 +11,18 @@ def respond(message, history, token, model, system_message, max_tokens, temperat
     
     # Default model selection logic
     if not token:
-        model = "HuggingFaceH4/zephyr-7b-beta"  # Default public model that doesn't require token
+        # Use default public model when no token is provided
+        model = "HuggingFaceH4/zephyr-7b-beta"
         try:
             client = InferenceClient(model=model)
         except Exception as e:
             yield f"Error initializing client: {str(e)}"
             return
     else:
-        model = model or "HuggingFaceH4/zephyr-7b-beta"  # Default private model
+        # Require model name when token is provided
+        if not model:
+            yield "Please provide a model name when using an HF token."
+            return
         try:
             client = InferenceClient(model=model, token=token)
         except Exception as e:
@@ -53,26 +57,24 @@ def respond(message, history, token, model, system_message, max_tokens, temperat
 # Input components
 token_input = gr.Textbox(
     type="password", 
-    label="HF API Token (leave empty for public models)",
+    label="HF API Token (leave empty for public model)",
     placeholder="hf_XXXXXXXXXXXX"
 )
-model_input = gr.Dropdown(
-    label="Model Name",
-    choices=[
-        "HuggingFaceH4/zephyr-7b-beta",
-    ],
-    value="HuggingFaceH4/zephyr-7b-beta"
+model_input = gr.Textbox(
+    label="Model Name (required if using token)",
+    placeholder="Enter model name when using token",
+    visible=True
 )
 
 # Chat interface
 demo = gr.ChatInterface(
     fn=respond,
-    title="HF Model Chat Interface",
-    description="Enter token for private models or use public models without token",
+    title="XYIZKO HF Text Generation Model Tester",
+    description="Uses Zephyr-7b-beta by default. Add token + model name for private models",
     additional_inputs=[
         token_input,
         model_input,
-        gr.Textbox(value="You are helpful AI.", label="System Message"),
+        gr.Textbox(value="You are helpful AI chatbot who reponds like a mideval knight who is extremely polite and noble.", label="System Message"),
         gr.Slider(1, 2048, value=512, label="Max Tokens"),
         gr.Slider(0.1, 4.0, value=0.7, label="Temperature"),
         gr.Slider(0.1, 1.0, value=0.95, label="Top-p"),